The second aim of the study is to examine the brain functions of adolescents in both treatment groups. Participants undergo functional Magnetic Resonance Imaging (fMRI) scans before and after treatment. The data from these scans will be used to compare the brains of participants in the BA condition with those in the fluoxetine condition. Also, the scans may show possible differences between participants' brains before and after treatment. These data may help scientists determine the ideal form of depression treatment for different types of people.